CN116783948A - Delay drift rate compensation in non-terrestrial network communications - Google Patents

Delay drift rate compensation in non-terrestrial network communications Download PDF

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Publication number
CN116783948A
CN116783948A CN202280009056.6A CN202280009056A CN116783948A CN 116783948 A CN116783948 A CN 116783948A CN 202280009056 A CN202280009056 A CN 202280009056A CN 116783948 A CN116783948 A CN 116783948A
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feeder link
drift rate
processor
obtaining
compensation
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阿布德卡德·麦多斯
吉列斯·查比特
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MediaTek Singapore Pte Ltd
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MediaTek Singapore Pte Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18563—Arrangements for interconnecting multiple systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/01—Reducing phase shift
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

Various solutions for synchronization in non-terrestrial network (NTN) communications are presented. An apparatus implemented in a User Equipment (UE) obtains at least one of a Downlink (DL) precompensation frequency value applied on a service link from a satellite of a non-terrestrial network (NTN) and a feeder link delay drift rate of a feeder link between a network node and the satellite. The device also obtains a doppler shift value. The apparatus then performs timing compensation by adjusting the sampling rate according to at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value.

Description

Delay drift rate compensation in non-terrestrial network communications
Cross-reference to related patent applications
The present disclosure is part of a non-provisional application claiming priority from U.S. provisional patent application No.63/136,229 filed 1-12-2021, the contents of which are incorporated herein by reference in their entirety.
Technical Field
The present disclosure relates generally to mobile communications, and more particularly to delay drift rate compensation in non-terrestrial network (NTN) communications.
Background
Unless otherwise indicated herein, the approaches described in this section are not prior art to the claims listed below and are not admitted to be prior art by inclusion in this section.
In NTN communications, in order to compensate for propagation delay and doppler shift in wireless communications over a link, a User Equipment (UE) needs to know some information. For example, a UE needs to know its UE location (e.g., via Global Navigation Satellite System (GNSS) positioning or known location), the location and velocity of satellites (or other flying objects) used as part of NTN communications, and a time reference for the location and velocity of the satellites. In the case where the satellite is the reference point, the UE will not need to obtain information about the feeder link between the land-based network node (e.g., base station) and the satellite. In the case where the propagation delay includes a feeder link, the UE will need to know the location of the land-based network node or information about the feeder link (e.g., feeder link delay and delay drift rate). In the event that there is a handover delay due to processing at the satellite, the UE will also need to know the handover delay.
The UE typically synchronizes the Downlink (DL) to the reception frequency and adjusts its clock fc=fc_nominal+fd based on the reception frequency, fc being the reception signal (i.e., the adjusted carrier frequency), fc_nominal being the nominal carrier frequency, fd being the doppler shift value. Thus, when sampling the received signal, the UE uses the adjusted sampling frequency fs=fs_nominal (fc_nominal+fd)/fc_nominal, fs being the adjusted sampling frequency and fs_nominal being the nominal sampling frequency. Typically, the UE will automatically adjust the DL frequency for the delay drift rate on the serving link, so delay drift on the serving link is typically not a problem. However, feeder link delay drift cannot be compensated by synchronizing to DL frequency.
Disclosure of Invention
The following summary is illustrative only and is not intended to be in any way limiting. That is, the following summary is provided to introduce a selection of concepts, gist, benefits and advantages of the novel and non-obvious techniques described herein. Selected implementations are further described in the detailed description below. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.
The object of the present disclosure is to propose a solution or a solution to the above-mentioned problems. More specifically, it is believed that the various schemes presented in this disclosure address issues related to timing compensation in NTN communications.
In one aspect, a method may involve an apparatus obtaining at least one of a Downlink (DL) precompensation frequency value applied on a service link from a satellite of a non-terrestrial network (NTN) and a feeder link delay drift rate of a feeder link between a network node and the satellite. The method may also involve the apparatus obtaining a doppler shift value. The method may further involve the apparatus performing timing compensation by adjusting the sampling rate according to at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value.
In another aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to wirelessly communicate with a non-terrestrial network (NTN). The processor may be configured to obtain, via the transceiver, at least one of a Downlink (DL) precompensation frequency value applied on a service link from a satellite of the NTN and a feeder link delay drift rate of a feeder link between a network node and the satellite, and obtain a doppler shift value. The processor may also perform timing compensation by adjusting the sampling rate in accordance with at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value.
Notably, while the description provided herein may be in the context of certain radio access technologies, networks and network topologies, such as Long Term Evolution (LTE), LTE-Advanced Pro, 5 th generation (5G), new Radio (NR), internet of things (IoT), narrowband internet of things (NB-IoT), industrial internet of things (IIoT), non-terrestrial network (NTN), and 6 th generation (6G), the proposed concepts, schemes, and any variations/derivatives thereof may be implemented in other types of radio access technologies, networks, and network topologies for other types of radio access technologies, networks, and network topologies. Accordingly, the scope of the disclosure is not limited to the examples described herein.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this disclosure. The accompanying drawings illustrate implementations of the present disclosure and, together with the description, serve to explain principles of the present disclosure. It will be appreciated that the drawings are not necessarily to scale, as some components may be shown out of scale in actual implementations for clarity of illustration of the concepts of the disclosure.
Fig. 1 is a diagram of an example network environment in which various proposed schemes according to the present disclosure may be implemented.
Fig. 2 is a block diagram of an example communication device and an example network device according to an implementation of the present disclosure.
Fig. 3 is a flow chart of an exemplary process according to an implementation of the present disclosure.
Fig. 4 is a flow chart of an exemplary process according to an implementation of the present disclosure.
Fig. 5 is a flow chart of an exemplary process according to an implementation of the present disclosure.
Detailed Description
Detailed embodiments and implementations of the claimed subject matter are disclosed herein. It is to be understood, however, that the disclosed embodiments and implementations are merely illustrative of the claimed subject matter, which may be embodied in various forms. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In the following description, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations.
SUMMARY
Implementations consistent with the present disclosure relate to various techniques, methods, schemes, and/or solutions related to timing compensation in NTN communications. In accordance with the present disclosure, a number of possible solutions may be implemented individually or in combination. That is, although these possible solutions may be described separately below, two or more of these possible solutions may be implemented in one combination or another.
Fig. 1 illustrates an example network environment 100 in which various proposed schemes according to the present disclosure may be implemented. Network environment 100 may relate to UE 110 and wireless network 120 (e.g., an LTE network, a 5G network, an NR network, an IoT network, an NB-IoT network, an IIoT network, an NTN network, or a 6G network). UE 110 may communicate with wireless network 120 via a non-terrestrial (NT) network node 125 (e.g., a satellite) and/or a terrestrial network node 128 (e.g., a gateway, base station, eNB, gNB, or transmission/reception point (TRP)).
Referring to fig. 1, nt network node 125 may be at V sat And relative motion/velocity U with respect to UE 110 sat_UE Moving, and there may be a feeder link delay t associated with the feeder link between the ground network node 128 and the NT network node 125 F . Accordingly, a propagation delay T may be caused d And Doppler shift f Doppler . In FIG. 1, f c Represents the frequency of the carrier signal and c represents the speed of light. Under various proposed schemes according to the present disclosure, each of UE 110, NT network node 125, and terrestrial network node 128 may be configured to perform operations for timing compensation in NTN communications in relation to at least one of DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values, as described below.
Under the scheme proposed according to the present disclosure, DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values may be broadcast by wireless network 120 in a broadcast message (e.g., a System Information Block (SIB)). In the case where the SIB is an existing SIB, the DL pre-compensation frequency value, feeder link delay drift rate, and doppler shift value may be added to the Information Element (IE) definition of the existing SIB. In the case that the SIB is a new SIB, a new IE including a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value may be defined for the new SIB.
Under the proposed scheme, the TA drift rate may also be broadcast by the wireless network 120 in a broadcast message. In the case where the SIB is an existing SIB, the TA drift rate may be added to the IE definition of the existing SIB. In the case where the SIB is a new SIB, a new IE may be defined for the new SIB including the TA drift rate.
Under the proposed scheme, UE 110 may acquire and apply the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value each time a SIB containing at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, the TA drift rate, and the doppler shift value is received, or only when explicitly indicated by wireless network 120. In the case where UE 110 applies the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value each time a SIB containing at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, the TA drift rate, and the doppler shift value is received, UE 110 may store the received DL pre-compensation frequency value, the received feeder link delay drift rate, and the received doppler shift value and update it when UE 110 acquires another transmission of the SIB from wireless network 120.
For example, UE 110 may consider the stored DL pre-compensation frequency value, the stored feeder link delay drift rate, and the stored doppler shift value as invalid and may replace the stored DL pre-compensation frequency value, the stored feeder link delay drift rate, and the stored doppler shift value with a new DL pre-compensation frequency value, a new feeder link delay drift rate, and a new doppler shift value that are contained in subsequently received SIBs.
Under the proposed scheme, a validity timer may be utilized and the duration of the validity timer may be predetermined (e.g., defined in a related 3GPP specification such as 3GPP specification release 16), configured by Radio Resource Control (RRC) signaling from the wireless network 120, indicated separately in SIBs, or indicated as part of a DL pre-compensation frequency value, feeder link delay drift rate, TA drift rate, or doppler shift value.
In the case where UE 110 applies the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value when explicitly indicated by wireless network 120, a change in SIB content may be explicitly indicated in the SIB (e.g., by switching one bit in the SIB) as a way of indicating that UE 110 applies the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value contained in the corresponding SIB. Thus, upon receiving the SIB containing the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value, UE 110 may apply the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value when the indication bit is switched (e.g., when its value is set to "1").
Under the proposed scheme, UE 110 may acquire SIBs with at least one of DL pre-compensation frequency value, feeder link delay drift rate, TA drift rate, and doppler shift value at different times. For example, UE 110 may acquire a SIB with at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, a TA drift rate, and a doppler shift value prior to a paging occasion. Alternatively or additionally, UE 110 may obtain a SIB with at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, a TA drift rate, and a doppler shift value after the paging message. Alternatively or additionally, UE 110 may acquire a SIB with at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, a TA drift rate, and a doppler shift value prior to a Random Access Channel (RACH) transmission.
Under the proposed scheme, upon successful acquisition of a SIB having at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value, UE 110 may apply the received DL pre-compensation frequency value indicated in the SIB, the received feeder link delay drift rate, and the received doppler shift value to adjust a sampling rate to compensate for delay times on the feeder link and the serving link.
DL pre-compensation frequency values, feeder link delay drift rate, and doppler shift values may be used by UE 110 in all RRC states or modes including, for example, but not limited to, IDLE mode (e.g., rrc_idle), CONNECTED mode (e.g., rrc_connected), and INACTIVE mode (e.g., rrc_inactive) (in NR). While in the rrc_connected mode, UE 110 may perform monitoring and acquisition of SIBs using at least one of DL pre-compensation frequency value, feeder link delay drift rate, TA drift rate, and doppler shift value.
For NB-IoT, it may be necessary to change UE behavior. In release 15 (Rel-15) of the 3GPP specifications, the NB-IoT UE does not acquire system information in rrc_connected mode when the timer is not running. As an option, wireless network 120 may provide DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values to UE 110 via dedicated signaling.
For example, wireless network 120 may provide DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values to UE 110 in an RRCConnectionReconfiguration message or rrcrecnonfiguration message. Notably, the option of using dedicated RRC messages to provide DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values to UE 110 may be to provide an alternative or supplement to DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values in SIBs (e.g., by broadcasting).
Under the proposed scheme, in case UE 110 cannot acquire SIBs with DL pre-compensation frequency values, feeder link delay drift rate, and doppler shift values (and for NTN cells), UE 110 may consider the cell as barred and thus may barre the cell for a predetermined period of time. Alternatively or additionally, with UE 110 in rrc_connected mode or rrc_inactive mode (in NR), UE 110 may return to rrc_idle mode and then perform cell reselection.
Under the proposed scheme, UE 110 may obtain at least one of a NT network node 125 (e.g., satellite) DL pre-compensation frequency value from a non-terrestrial network and a feeder link delay drift rate of a feeder link between network device 220 (e.g., base station) and the satellite. The DL pre-compensation frequency values are applied by the satellite on the service link based on the doppler expected at the center of the satellite beam on the ground. In some implementations, UE 110 receives a feeder link delay drift rate from network device 220. In some implementations, UE 110 obtains a Timing Advance (TA) drift rate for the feeder link and derives the feeder link delay drift rate as half the TA drift rate.
UE 110 may obtain a doppler shift value for the serving link. In some implementations, UE 110 measures the receive frequency of the DL signal and derives a doppler shift value from the receive frequency and the nominal frequency. Doppler shift value fd=fc-fc_nominal, fc being the receiving frequency and fc_nominal being the nominal frequency.
UE 110 may perform timing compensation by adjusting the sampling rate according to at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value.
In some implementations, UE 110 may perform timing compensation by adjusting the sampling rate according to all DL pre-compensation frequency values, feeder link delay drift rate, and doppler shift value. The adjusted sampling rate fs_adjusted=fs (1-ddrift_fl)/(fc_nominal+fd)/(fc_nominal-f_precomp+fd), fs is the sampling rate derived based on synchronization to the DL frequency, ddrift_fl is the feeder link delay drift rate, fc_nominal is the nominal frequency, fd is the doppler shift value, and f_precomp is the DL precompensation frequency value.
The adjusted sampling rate may be calculated by fs_adjusted-fs (1-ddrift_fl+f_precomp/(fc_nominal-f_precomp+fd)).
If there is no common doppler (i.e., DL pre-compensation frequency value and doppler shift value), the processor 212 performs timing compensation based solely on the feeder link delay drift rate and calculates an adjusted sampling rate by fs_adjusted=fs (1-ddrift_fl).
If no feeder link delay drift rate is present, the adjusted sampling rate is calculated by fs_adjusted to fs (1+f_precomp/(fc_normal-f_precomp+fd)).
Under the proposed scheme, timing compensation may be performed by adjusting DL timing of NT network node 125 (e.g., a satellite) serving UE 110.
In some implementations, UE 110 may also measure the receive frequency of the DL signal and derive a doppler shift value from the receive frequency and the nominal frequency.
Illustrative implementation
Fig. 2 illustrates an example communication device 210 and an example network device 220 according to an implementation of the disclosure. Each of the communication device 210 and the network device 220 may perform various functions to implement the schemes, techniques, processes, and methods described herein in connection with DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values for timing compensation in NTN communications, including the scenarios/schemes described above and the processes 300, 400, and 500 described below.
The communication device 210 may be part of an electronic device, which may be a UE, such as a portable or mobile device, a wearable device, a wireless communication device, or a computing device. For example, the communication device 210 may be implemented in a smart phone, a smart watch, a personal digital assistant, a digital camera, or a computing device such as a tablet computer, a laptop computer, or a notebook computer. The communication device 210 may also be part of a machine type device, which may be an IoT, NB-IoT, IIoT, or NTN device, such as a fixed or stationary device, a home device, a wired communication device, or a computing device. For example, the communication device 210 may be implemented in a smart thermostat, a smart refrigerator, a smart door lock, a wireless speaker, or a home control center.
Alternatively, communication device 210 may be implemented in the form of one or more Integrated Circuit (IC) chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, one or more Reduced Instruction Set Computing (RISC) processors, or one or more Complex Instruction Set Computing (CISC) processors. The communication device 210 may include at least some of those components shown in fig. 2, such as the processor 212. The communication device 210 may also include one or more other components (e.g., an internal power source, a display device, and/or a user interface device) that are not relevant to the schemes presented in the present disclosure, and thus, for simplicity and brevity, such components of the communication device 210 are neither shown in fig. 2 nor described below.
The network device 220 may be part of an electronic device/station, which may be a network node such as a base station, small cell, router, gateway, or satellite. For example, the network device 220 may be implemented in an eNodeB in LTE, in a gNB in 5G, NR, 6G, ioT, NB-IoT, IIoT, or in a satellite in an NTN network. Alternatively, network device 220 may be implemented in the form of one or more IC chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors. Network device 220 may include at least some of those components shown in fig. 2, such as processor 222. The network device 220 may also include one or more other components (e.g., internal power supplies, display devices, and/or user interface devices) that are not relevant to the proposed solution of the present disclosure, and thus, for simplicity and brevity, such components of the network device 220 are neither shown in fig. 2 nor described below.
In one aspect, each of processor 212 and processor 222 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, although the singular term "processor" is used herein to refer to the processor 212 and the processor 222, in some implementations, each of the processor 212 and the processor 222 may include multiple processors, while in other implementations a single processor may be included. In another aspect, each of the processor 212 and the processor 222 may be implemented in hardware (and optionally firmware) having electronic components including, for example, but not limited to, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors, and/or one or more varactors, configured and arranged to achieve particular objects in accordance with the present disclosure. In other words, in at least some implementations, each of processor 212 and processor 222 is a special purpose machine specifically designed, set up, and configured to perform specific tasks including power consumption reduction in devices (e.g., represented by communication device 210) and networks (e.g., represented by network device 220) according to various implementations of the present disclosure.
In some implementations, the communication device 210 may also include a transceiver 216 coupled to the processor 212 and capable of wirelessly transmitting and receiving data. In some implementations, the communication device 210 may also include a memory 214 coupled to the processor 212 and capable of being accessed by the processor 212 and storing data therein. In some implementations, the network device 220 may also include a transceiver 226 coupled to the processor 222 and capable of wirelessly transmitting and receiving data. In some implementations, the network device 220 may also include a memory 224 coupled to the processor 222 and capable of being accessed by the processor 222 and storing data therein. Accordingly, communication device 210 and network device 220 may communicate wirelessly with each other via transceiver 216 and transceiver 226, respectively.
Each of the communication device 210 and the network device 220 may be communication entities capable of communicating with each other using various schemes proposed according to the present disclosure. To facilitate better understanding, the following description of the operation, functionality, and capabilities of each of communication device 210 and network device 220 is provided in the context of a mobile communication environment in which communication device 210 is implemented in or as a communication device or UE (e.g., UE 110) such as network 120 and network device 220 is implemented in or as a network node or base station (e.g., NT network node 125 or terrestrial network node 128) of a communication network (e.g., network 120). It is also noted that while the example implementations described below are provided in the context of NTN communications, they may be implemented in other types of networks as well.
Under the proposed scheme for timing compensation in NTN communication in relation to DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values according to the present disclosure, communication device 210 is implemented in UE 110 or as UE 110 in network environment 100, and network device 220 is implemented in NT network node 125 or terrestrial network node 128 or as NT network node 125 or terrestrial network node 128 in network environment 100.
The processor 212 of the communication device 210 can receive DL pre-compensation frequency values from NT network nodes 125 (e.g., satellites) of a non-terrestrial network. The DL pre-compensation frequency values are applied by the satellite on the service link based on the doppler expected at the center of the satellite beam on the ground.
The processor 212 may obtain a feeder link delay drift rate of a feeder link between the network device 220 (e.g., a base station) and the satellite. In some implementations, the processor 212 may receive the feeder link delay drift rate from the network device 220. In some implementations, the processor 212 obtains the TA drift rate for the feeder link, which the processor 212 may derive as half the TA drift rate.
The processor 212 may obtain a doppler shift value for the serving link. In some implementations, the processor 212 may measure the receive frequency of the DL signal and derive the doppler shift value from the receive frequency and the nominal frequency. The doppler shift value fd=fc-fc_nominal, fc is the reception frequency, and fc_nominal is the nominal frequency.
Further, the processor 212 may perform timing compensation by adjusting the sampling rate according to at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value.
In one aspect, the processor 212 may perform timing compensation by adjusting the sampling rate according to all DL pre-compensation frequency values, feeder link delay drift rate, and doppler shift value. The adjusted sampling rate fs_adjusted=fs (1-ddrift_fl)/(fc_nominal+fd)/(fc_nominal-f_precomp+fd), fs is the sampling rate derived based on synchronization to the DL frequency, ddrift_fl is the feeder link delay drift rate, fc_nominal is the nominal frequency, fd is the doppler shift value, and f_precomp is the DL precompensation frequency value.
It should be noted that since the DL signal to be measured already includes a doppler shift value, when timing compensation is performed, the DL pre-compensation frequency value needs to be signaled to the communication device 210 to be removed. Therefore, when calculating the adjusted sampling rate, the DL pre-compensation frequency value needs to be removed. Furthermore, DL precompensation frequency values may be beam specific.
On the other hand, the adjusted sampling rate may be calculated by fs_adjusted to fs (1-ddrift_fl+f_precomp/(fc_normal-f_precomp+fd)).
In one aspect, if there is no common doppler (i.e., DL pre-compensation frequency value and doppler shift value), the processor 212 performs timing compensation based solely on feeder link delay drift rate and calculates the adjusted sampling rate by fs_adjusted=fs (1-ddrift_fl).
On the other hand, if there is no feeder link delay drift rate, the adjusted sampling rate is calculated by fs_adjusted to fs (1+f_precomp/(fc_nominal-f_precomp+fd)).
Another method of timing compensation is to adjust DL timing of satellites serving UE 110.
In some implementations, the processor 212 may also measure the received frequency of the DL signal and derive a doppler shift value from the received frequency and the nominal frequency.
In some implementations, when obtaining the DL pre-compensation frequency value, the processor 212 may obtain the DL pre-compensation frequency value via dedicated signaling within an RRC message, such as an RRC connection reconfiguration (RRCConnectionReconfiguration) message or an RRC reconfiguration (rrcrecnonconfiguration) message.
In some implementations, the processor 212 may perform certain operations when obtaining the DL pre-compensation frequency value. For example, the processor 212 may obtain a SIB containing a DL precompensation frequency value. Further, the processor 212 may receive SIBs from the wireless network that contain DL precompensation frequency values.
In some implementations, the processor 212 may perform additional operations. For example, the processor 212 may store the DL pre-compensation frequency values in the memory 214. Further, the processor 212 may update the stored DL pre-compensation frequency value with a new DL pre-compensation frequency value that is subsequently received from the wireless network.
In some implementations, the processor 212 may perform certain operations when updating the stored DL pre-compensation frequency values. For example, the processor 212 may determine the status of the validity timer. Further, the processor 212 may perform any of the following: (a) Updating the stored DL pre-compensation frequency value with a new DL pre-compensation frequency value in response to the validity timer having expired (e.g., by re-acquiring SIBs with DL pre-compensation frequency values); or (b) in response to the validity timer being run, continuing to use the stored DL pre-compensation frequency value without updating the stored DL pre-compensation frequency value with a new DL pre-compensation frequency value.
In some implementations, the duration of the validity timer may be predetermined. Alternatively, the duration of the validity timer may be configured by RRC signaling from the wireless network. Alternatively, the duration of the validity timer may be indicated separately in the SIB containing the DL precompensation frequency value. Alternatively, the duration of the validity timer may be indicated in the SIB as part of the DL precompensation frequency value.
In some implementations, when obtaining the feeder link delay drift rate, the processor 212 may receive the feeder link delay drift rate via dedicated signaling within an RRC message, such as an RRC connection reconfiguration (RRCConnectionReconfiguration) message or an RRC reconfiguration (rrcrecnonconfiguration) message. Alternatively, the processor 212 may receive the TA drift rate via dedicated signaling within the RRC message and calculate the feeder link delay drift rate as half the TA drift rate.
In some implementations, the processor 212 may perform certain operations when obtaining the feeder link delay drift rate. For example, the processor 212 may obtain a SIB containing feeder link delay drift rate. Alternatively, the processor 212 may obtain SIBs containing TA drift rates and calculate the feeder link delay drift rate as half the TA drift rate. Further, the processor 212 may receive SIBs from the wireless network that contain feeder link delay drift rates. Alternatively, the processor 212 may receive SIBs containing TA drift rates and calculate the feeder link delay drift rate to be half the TA drift rate.
In some implementations, the processor 212 may perform additional operations. For example, the processor 212 may store the feeder link delay drift rate in the memory 214. Further, the processor 212 may update the stored feeder link delay drift rate with a new feeder link delay drift rate subsequently received from the wireless network.
In some implementations, the processor 212 may perform certain operations in updating the stored feeder link delay drift rate. For example, the processor 212 may determine the status of the validity timer. Further, the processor 212 may perform any of the following: (a) Updating the stored feeder link delay drift rate with the new feeder link delay drift rate in response to the validity timer having expired (e.g., by reacquiring SIBs with the feeder link delay drift rate or TA drift rate); or (b) in response to the availability timer being running, continuing to use the stored feeder link delay drift rate without updating the stored feeder link delay drift rate with a new feeder link delay drift rate.
In some implementations, the duration of the validity timer may be fixed. Alternatively, the duration of the validity timer may be configured by RRC signaling from the wireless network. Alternatively, the duration of the validity timer may be indicated separately in the SIB containing the feeder link delay drift rate or the TA drift rate. Alternatively, the duration of the validity timer may be indicated in the SIB as part of the feeder link delay drift rate.
In some implementations, when obtaining the doppler shift value, the processor 212 may receive the doppler shift value via dedicated signaling within an RRC message, such as an RRC connection reconfiguration (RRCConnectionReconfiguration) message or an RRC reconfiguration (rrcrecnonconfiguration) message. Alternatively, the processor 212 may measure the received frequency of the DL signal and derive the doppler shift value from the received frequency and the nominal frequency.
In some implementations, the processor 212 may perform certain operations when obtaining the doppler shift value. For example, the processor 212 may obtain a SIB containing a doppler shift value. Alternatively, the processor 212 may measure the reception frequency of the DL signal and derive the doppler shift value from the reception frequency and the nominal frequency. Further, the processor 212 may receive SIBs from the wireless network that contain doppler shift values. Alternatively, the processor 212 may measure the reception frequency of the DL signal and derive the doppler shift value from the reception frequency and the nominal frequency.
In some implementations, the processor 212 may perform additional operations. For example, the processor 212 may store the Doppler shift value in the memory 214. In addition, the processor 212 may update the stored doppler shift value with a new doppler shift value subsequently received from the wireless network.
In some implementations, the processor 212 may perform certain operations in updating the stored doppler shift value. For example, the processor 212 may determine the status of the validity timer. Further, the processor 212 may perform any of the following: (a) Updating the stored doppler shift value with a new doppler shift value in response to the validity timer having expired (e.g., by re-acquiring SIBs with feeder link delay drift rate, or measuring the received frequency of the DL signal); or (b) in response to the validity timer being running, continuing to use the stored doppler shift value without updating the stored doppler shift value with a new doppler shift value.
In some implementations, the duration of the validity timer may be fixed. Alternatively, the duration of the validity timer may be configured by RRC signaling from the wireless network. Alternatively, the duration of the validity timer may be indicated separately in the SIB containing the doppler shift value. Alternatively, the duration of the validity timer may be indicated in the SIB as part of the doppler shift value.
Exemplary treatment
Fig. 3-5 illustrate exemplary processes 300, 400, and 500 according to implementations of the present disclosure. Processes 300, 400, and 500 may be example implementations, whether partially or fully, of the above-described schemes for timing compensation in NTN communications with respect to DL pre-compensation frequency values, feeder link delay drift rates, and doppler shift values according to the present disclosure. Processes 300, 400, and 500 may represent aspects of the implementation of features of communication device 210. Processes 300, 400, and 500 may include one or more operations, acts, or functions as illustrated by one or more blocks.
Although illustrated as discrete blocks, the various blocks of processes 300, 400, and 500 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Further, the blocks of processes 300, 400, and 500 may be performed in a sequential order, or alternatively, in a different order. Processes 300, 400, and 500 may be implemented by communication device 210 or any suitable UE or machine type device. For illustrative purposes only and not limitation, processes 300, 400, and 500 are described below in the context of communication device 210 and network device 220.
Process 300 may begin at block 310. At block 310, the process 300 may involve the processor 212 of the communication device 210 obtaining, via the transceiver 216, at least one of a Downlink (DL) pre-compensation frequency value applied on a service link from a satellite of a non-terrestrial network (NTN) and a feeder link delay drift rate of a feeder link between a network node and the satellite.
At block 310, the feeder link delay drift rate for obtaining the feeder link between the network node and the satellite may be replaced by process 400 shown in fig. 4. Fig. 4 begins at block 410. At block 410, process 400 may involve processor 212 obtaining a TA drift rate for the feeder link. From block 410, process 400 may proceed to block 420.
At block 420, process 400 may involve processor 212 deriving a feeder link delay drift rate as half of the TA drift rate.
In other words, where the processor 212 only obtains the TA drift rate and does not receive the feeder link delay drift rate from the network node, the processor 212 may derive the feeder link delay drift rate from the TA drift rate. Alternatively, if only the feeder link delay drift rate is provided, the TA drift rate may be derived as twice the feeder link delay drift rate.
Returning to process 300, process 300 may proceed from block 310 to block 320. At block 320, the process 300 may include the processor 212 obtaining a doppler shift value.
Block 320 may be replaced by process 500 shown in fig. 5. Fig. 5 begins at block 510. At block 510, process 500 may involve processor 212 measuring a reception frequency of the DL signal. Process 500 may proceed from block 510 to block 520.
At block 520, the process 500 may include the processor 212 deriving a Doppler shift value from the received frequency and the nominal frequency.
Returning to process 300, process 300 may proceed from block 320 to block 330. At block 330, the process 300 may involve the processor 212 performing timing compensation by adjusting the sampling rate in accordance with at least one of a DL pre-compensation frequency value, a feeder link delay drift rate, and a doppler shift value.
Additional annotations
The subject matter described herein sometimes illustrates different components contained within or connected with different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Thus, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected," or "operably coupled," to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable," to each other to achieve the desired functionality. Specific examples of operably coupled include, but are not limited to, physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interactable components.
Furthermore, with respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. For clarity, various singular/plural permutations may be explicitly set forth herein.
Furthermore, those skilled in the art will understand that, in general, terms used herein, and especially in the appended claims, such as the main body of the appended claims, are generally intended as "open" terms, e.g., the term "comprising" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," and the term "comprising" should be interpreted as "including but not limited to. Those skilled in the art will further understand that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one", and indefinite articles such as "a" or "an", e.g., "a" and/or "an" should be interpreted to mean "at least one" or "one or more; the same applies to the use of explicit articles introduced into the recitation of the claims. Furthermore, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, and the bare recitation of "two recitations," without other modifiers, for example, means at least two recitations, or two or more recitations. Further, in those cases, the convention is similar to at least one of "A, B and C, etc. Generally, using such a configuration, for example, "a system having at least one of A, B and C" would include, but is not limited to, a system having a alone a, B alone, C, A and B together, a and C together, B and C together, and/or A, B and C together, etc., in the sense that persons skilled in the art understand the convention. In those cases where convention is similar to "at least one of A, B or C". Generally, such a configuration is intended to be used in the sense of what one of ordinary skill in the art would understand conventional, e.g., "a system having at least one of A, B or C" would include, but is not limited to, a system having a alone a, B alone, C, A and B together, a and C together, B and C together, and/or A, B and C together. Those skilled in the art will further appreciate that virtually any disjunctive word and/or phrase presenting two or more alternative terms in the description, claims, or drawings should be understood to encompass the possibility of including one of the terms, either of the terms, or both terms. For example, the phrase "a or B" will be understood to include the possibilities of "a" or "B" or "a and B".
From the foregoing, it will be appreciated that various embodiments of the invention have been described herein for purposes of illustration, and that various modifications may be made without deviating from the scope and spirit of the invention. Therefore, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Claims (20)

1. A method, comprising:
obtaining, by a processor of an apparatus, at least one of a Downlink (DL) precompensation frequency value applied on a service link from a satellite of a non-terrestrial network (NTN) and a feeder link delay drift rate of a feeder link between a network node and the satellite;
obtaining, by the processor, a doppler shift value; and
timing compensation is performed by the processor by adjusting a sampling rate according to at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value.
2. The method of claim 1, wherein the timing compensation is performed by adjusting Downlink (DL) timing of the satellite.
3. The method of claim 1, further comprising:
obtaining, by the processor, a Timing Advance (TA) drift rate of the feeder link; and
Deriving, by the processor, the feeder link delay drift rate as half the TA drift rate.
4. The method of claim 1, wherein the DL pre-compensation frequency value is beam specific.
5. The method of claim 1, further comprising:
measuring, by the processor, a reception frequency of the DL signal; and
the Doppler shift value is derived by the processor from the received frequency and a nominal frequency.
6. The method of claim 1, wherein obtaining a feeder link delay drift rate comprises obtaining a System Information Block (SIB) containing the feeder link delay drift rate.
7. The method of claim 1, wherein obtaining a feeder link delay drift rate comprises: the feeder link delay drift rate is received via dedicated signaling within a Radio Resource Control (RRC) message.
8. The method of claim 1, wherein obtaining the DL pre-compensation frequency value comprises obtaining a System Information Block (SIB) containing the DL pre-compensation frequency value.
9. The method of claim 1, wherein obtaining the DL precompensation frequency value comprises: the DL pre-compensation frequency value is obtained via dedicated signaling within a Radio Resource Control (RRC) message.
10. The method of claim 1, wherein obtaining the doppler shift value comprises: a System Information Block (SIB) containing the doppler shift value is acquired prior to a Random Access Channel (RACH) transmission.
11. An apparatus, comprising:
a transceiver configured to wirelessly communicate with a non-terrestrial network (NTN); and
a processor coupled to the transceiver and configured to perform operations comprising:
obtaining, via the transceiver, at least one of a Downlink (DL) precompensation frequency value applied on a service link from a satellite of the NTN and a feeder link delay drift rate of a feeder link between a network node and the satellite;
obtaining Doppler frequency shift value; and
timing compensation is performed by adjusting a sampling rate in accordance with at least one of the DL pre-compensation frequency value, the feeder link delay drift rate, and the doppler shift value.
12. The apparatus of claim 11, wherein the timing compensation is performed by adjusting Downlink (DL) timing of the satellite.
13. The apparatus of claim 11, wherein the processor further performs the following:
Obtaining, via the transceiver, a Timing Advance (TA) drift rate of the feeder link; and
and obtaining the delay drift rate of the feeder link as half of the TA drift rate.
14. The apparatus of claim 11, wherein the DL pre-compensation frequency value is beam specific.
15. The apparatus of claim 11, wherein the processor further performs the following:
measuring a reception frequency of the DL signal; and
and obtaining the Doppler frequency shift value according to the receiving frequency and the nominal frequency.
16. The apparatus of claim 11, wherein the processor obtains a System Information Block (SIB) containing the feeder link delay drift rate when obtaining the feeder link delay drift rate.
17. The apparatus of claim 11, wherein the processor receives the feeder link delay drift rate within a Radio Resource Control (RRC) message via the transceiver when obtaining the feeder link delay drift rate.
18. The apparatus of claim 11, wherein the processor obtains a System Information Block (SIB) containing the DL pre-compensation frequency value when obtaining the DL pre-compensation frequency value.
19. The apparatus of claim 11, wherein the processor obtains the DL pre-compensation frequency value within a Radio Resource Control (RRC) message via the transceiver when obtaining the DL pre-compensation frequency value.
20. The apparatus of claim 11, wherein obtaining the doppler shift value comprises: a System Information Block (SIB) containing the doppler shift value is acquired prior to a Random Access Channel (RACH) transmission.
CN202280009056.6A 2021-01-12 2022-01-12 Delay drift rate compensation in non-terrestrial network communications Pending CN116783948A (en)

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US6058306A (en) * 1998-11-02 2000-05-02 Hughes Electronics Corporation Compensation of dynamic doppler frequency of large range in satellite communication systems
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